Solo

so·lo /’sōlō/
(plural solos or soli /-li/) a piece of vocal or instrumental music or a dance, or a part or passage in one, for one performer.
[Noun] A thing done by one person unaccompanied, in particular.
[Adjective] For or done by one person alone; unaccompanied.
[Verb] Perform something unaccompanied, in particular.

Two concepts completely different. Two pairs of hands far from each other. Without more defense than themselves, the Pianist and The Onanist are facing loneliness separately. Thus shake hands in the distance to make a SOLO.